Audi A8 (4E) Rain/Light Sensor

Coding

• Byte 00: Rain Sensor Correction (Infrared Transperency at 880nm)
• Byte 01: Light Sensor Correction (Transperency)
• Byte 02: Options
  • +1 = Highway Light
  • +2 = Rain Light

• Notes
  • If a coding needs to be altered, it has to be converted from decimal (dec) to hexadecimal (hex).
  • Bytes are counted from right to left, starting with 0. This is backwards from what you may be used to from editing Long Codings.
  • Bits are counted from right to left, starting with 0.
  • Once converted to hex each byte has to be converted to decimal seperately.
  • Byte 02 coding is the sum of the individual options.
• Example
  • Coding is "00217165" (dec) = "03504D" (hex)
  • Byte 00 = 4D (hex) = 77 (dec) = Rain Sensor Correction value is 77%
  • Byte 01 = 50 (hex) = 80 (dec) = Light Sensor Correction value is 80%
  • Byte 02 = 03 (hex) = 03 (dec) = 01+02 = Options 01 (Highway Light) and 02 (Rain Light) set